Advanced Auto Parts has begun contacting customers it has identified as potential victims of a data breach.

Advance Auto Parts, a leading auto parts retailer, has begun sending letters to customers impacted by a data breach that may have exposed financial information of up to 56,000 people.

The retailer reported March 31 that a "network intrusion" had exposed financial information and was the subject of a criminal investigation. Fourteen of the retailer's stores, including locations in Georgia, Ohio, Louisiana, Tennessee, Mississippi, Indiana, Virginia and New York, are believed to have been affected.

Advance Auto Parts did not specify how customer financial information had been revealed or how access had been gained to its network. In response to the incident, the company notified its credit, debit and check processors.

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